EP 0214691 B1 19911204 - MONITOR SYSTEM FOR TRAFFIC-LIGHTS
Title (en)
MONITOR SYSTEM FOR TRAFFIC-LIGHTS
Publication
Application
Priority
AU PH229885 A 19850905
Abstract (en)
[origin: EP0214691A2] A monitor circuit arrangement for traffic lights wherein energy is supplied from an alternating voltage supply source(s) to a lamp (L 1) via a controlled switch (SD 1) and energization of the unit is monitored by a voltage comparator (100) connected in cascade with a sensing latch (SL 1), the voltage comparator (100) being such that its output is activated in response to its input voltage exceeding a predetermined magnitude of either polarity relative to a common reference voltage wave, a monitored voltage representative of the voltage present across the lamp (1 1) being supplied as input voltage to the voltage comparator(100), the output of which is fed to the sensing latch set input, reset means (RPS) being provided for resetting the latch at the commencement of each cycle of the alternating supply voltage.
IPC 1-7
IPC 8 full level
G05F 1/10 (2006.01); G08G 1/095 (2006.01); G08G 1/097 (2006.01)
CPC (source: EP US)
G08G 1/097 (2013.01 - EP US)
Designated contracting state (EPC)
DE FR GB SE
DOCDB simple family (publication)
EP 0214691 A2 19870318; EP 0214691 A3 19890517; EP 0214691 B1 19911204; JP S6257013 A 19870312; US 4811010 A 19890307
DOCDB simple family (application)
EP 86201494 A 19860901; JP 20808486 A 19860905; US 90300486 A 19860902